﻿<html lang="en">
<head>
<meta charset="utf-8">
<title>Layui引入示例</title>
<style type="text/css">
    .nav{
       left: 0;
       top: 0;
       position: absolute;
       width: 100%;
       height: 56px;
       background: rgba(255,0,0,0.5);
     }
</style>
</head>
<body>
<p>这是一段文字</p>
<div class="nav">

</div>
</body>
</html>